This explanation describes the observation of a patient with psoriasis, the most common associated condition in adults. The observations suggest that the patient may be experiencing dehydration, which is a complication of this condition.

Further Reading:

Erythroderma is a rare inflammatory skin condition that affects the majority of a person’s skin surface area. It is characterized by widespread redness, intense itching, and peeling of the skin. The condition can occur in people of all ages and races, but it is more common in males. Erythroderma is considered a dermatological emergency due to the potential for life-threatening complications.

The most common causes of erythroderma are exacerbations of pre-existing skin conditions, such as atopic dermatitis, psoriasis, and lichen planus. However, approximately one-third of cases are idiopathic, meaning the cause is unknown. Other less common skin conditions and systemic illnesses, including certain types of lymphoma and leukemia, can also lead to erythroderma.

Clinical features of erythroderma include generalized redness and swelling of at least 90% of the skin surface area. This is often preceded by a rash or dermatitis. The intense itching associated with the condition can lead to scratching and thickening of the skin. Skin scaling or peeling typically occurs a few days after the onset of redness. Other symptoms may include hair loss, yellowing of the palms and soles, nail abnormalities, and swollen lymph nodes. Patients may also feel generally unwell.

Erythroderma can lead to significant complications, including dehydration, electrolyte imbalances, hypothermia, heart failure, and secondary skin infections. Diagnosis is typically made based on clinical presentation, but further investigations may be done to assess the patient’s overall condition and identify any underlying causes.

Treatment of erythroderma involves addressing the underlying cause, if known. Trigger medications should be discontinued, and supportive measures such as fluid resuscitation, correction of electrolyte imbalances, and treatment of secondary infections should be implemented. Medications for symptom relief, such as painkillers and antihistamines, may also be prescribed. Emollients are often recommended to soothe the skin. In some cases, steroids and immunosuppressants may be used, depending on the underlying cause of the erythroderma.

Chickenpox is a highly contagious illness caused by the varicella-zoster virus, a DNA virus from the Herpesviridae family. Most cases are mild to moderate, and the infection usually resolves on its own. Severe complications are rare but can occur, especially in individuals with weakened immune systems or underlying health conditions.

The incubation period for chickenpox is typically between 14 to 21 days. It is contagious from a few days before the rash appears until about a week after the first lesions show up.

The common clinical features of chickenpox include:

– Fever, which lasts for approximately 3-5 days.
– The initial rash starts as flat red spots and progresses into raised bumps.
– These bumps then turn into fluid-filled blisters and eventually form pustules surrounded by redness.
– The lesions are extremely itchy.
– The rash reaches its peak around 48 hours in individuals with a healthy immune system.
– The rash tends to be more concentrated on the face and trunk, with fewer lesions on the limbs.
– The blisters eventually dry up and form crusts, which can lead to scarring if scratched.
– Headache, fatigue, and abdominal pain may also occur.

Chickenpox tends to be more severe in teenagers and adults compared to children. Antiviral treatment should be considered for these individuals if they seek medical attention within 24 hours of rash onset. The recommended oral dose of aciclovir is 800 mg taken five times a day for seven days.

Immunocompromised patients and those at higher risk, such as individuals with severe cardiovascular or respiratory disease or chronic skin disorders, should receive antiviral treatment for ten days, with at least seven days of intravenous administration.

Although most cases are relatively mild, if serious complications like pneumonia, encephalitis, or dehydration are suspected, it is important to refer the patient for hospital admission.

For more information, you can refer to the NICE Clinical Knowledge Summary on Chickenpox.
https://cks.nice.org.uk/topics/chickenpox/

Tinea cruris, commonly known as ‘jock itch’, is a fungal infection that affects the groin area. It is primarily caused by Trichophyton rubrum and is more prevalent in young men, particularly athletes. The typical symptoms include a reddish or brownish rash that is accompanied by intense itching. Pustules and vesicles may also develop, and there is often a raised border with a clear center. Notably, the infection usually does not affect the penis and scrotum.

It is worth mentioning that patients with tinea cruris often have concurrent tinea pedis, also known as athlete’s foot, which may have served as the source of the infection. The infection can be transmitted through sharing towels or by using towels that have come into contact with infected feet, leading to the spread of the fungus to the groin area.

Fortunately, treatment for tinea cruris typically involves the use of topical imidazole creams, such as clotrimazole. This is usually sufficient to alleviate the symptoms and eradicate the infection. Alternatively, terbinafine cream can be used as an alternative treatment option.

The initial stage of SJS is characterized by a rash on the skin, specifically on the macular area. As the condition progresses, the rash transforms into blisters, known as bullae, which eventually detach from the skin.

Further Reading:

Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) are severe mucocutaneous immune reactions characterized by blistering skin rash and erosions/ulceration of mucous membranes. SJS has less than 10% total body surface area (TBSA) involvement, SJS/TEN overlap has 10% to 30% TBSA involvement, and TEN has more than 30% TBSA involvement. The exact cause of SJS and TEN is not well understood, but it is believed to be a T-cell–mediated cytotoxic reaction triggered by drugs, infections, or vaccinations. Drugs are responsible for 50% of SJS cases and up to 95% of TEN cases, with antibiotics and anticonvulsants being the most common culprits.

The clinical features of SJS and TEN include a prodrome of malaise, fever, headache, and cough, followed by the appearance of small pink-red macules with darker centers. These macules can coalesce and develop into larger blisters (bullae) that eventually break and cause the epidermis to slough off. Painful mucosal erosions can also occur, affecting various parts of the body and leading to complications such as renal failure, hepatitis, pneumonia, and urethritis. Nikolsky’s sign, which refers to the easy sloughing off of the epidermal layer with pressure, is a characteristic feature of SJS and TEN.

The diagnosis of SJS, SJS/TEN overlap, and TEN can be confirmed through a skin biopsy, which typically shows desquamation at the epidermal-papillary dermal junction and the presence of necrotic epithelium and lymphocytes. Management of SJS and TEN involves supportive care, withdrawal of the causative agent if drug-related, monitoring for metabolic derangement and infection, maintaining the airway, treating respiratory function and pneumonia, fluid resuscitation, wound care, analgesia, and nutritional support. Ophthalmology consultation is also recommended. Intravenous immunoglobulin, ciclosporin, corticosteroids, and plasmapheresis may be used in treatment, but there is limited evidence supporting their effectiveness.

The prognosis of SJS and TEN can be assessed using the SCORTEN score, which comprises of 7 clinical and biological parameters, with the predicted probability of mortality ranging from 3.2% to 90.0%.

Acne conglobata is an extremely severe form of acne where acne nodules come together and create sinuses. Acne fulminans, on the other hand, is a rare and severe complication of acne conglobata that is accompanied by systemic symptoms. It is linked to elevated levels of androgenic hormones, specific autoimmune conditions, and a genetic predisposition.

The typical clinical characteristics of acne fulminans are as follows:

– Sudden and abrupt onset
– Inflammatory and ulcerated nodular acne primarily found on the chest and back
– Often painful lesions
– Ulcers on the upper trunk covered with bleeding crusts
– Severe acne scarring
– Fluctuating fever
– Painful joints and arthropathy
– General feeling of illness (malaise)
– Loss of appetite and weight loss
– Enlarged liver and spleen (hepatosplenomegaly)

It is crucial to refer patients immediately for a specialist evaluation and hospital admission. Treatment options for acne fulminans include systemic corticosteroids, dapsone, ciclosporin, and high-dose intravenous antibiotics.

Pemphigus, derived from the Greek word for bubble ‘pemphix’, refers to a group of autoimmune disorders that cause blistering of the skin and/or mucosal surfaces. The most common subset is pemphigus vulgaris (PV), which accounts for approximately 70% of cases worldwide. PV is characterized by an autoimmune response where autoantibodies target cell surface antigens on keratinocytes, specifically desmogleins 1 and 3. This leads to a loss of cell-to-cell adhesion and separation, resulting in blister formation.

On the other hand, bullous pemphigoid (BP) is a chronic autoimmune blistering skin disorder that affects the subepidermal layer. It occurs when the basement membrane of the epidermis is attacked by IgG and sometimes IgE immunoglobulins, as well as activated T lymphocytes. The binding of autoantibodies to proteins and the release of cytokines from T cells trigger complement activation, neutrophil recruitment, and the release of proteolytic enzymes. These enzymes destroy the hemidesmosomes, leading to the formation of subepidermal blisters.

To summarize the differences between pemphigus vulgaris and bullous pemphigoid, the following provides a comparison:

Pemphigus Vulgaris:
– Age: Middle-aged people (mean age 50)
– Oral involvement: Common
– Blister type: Large, flaccid, and painful
– Blister content: Fluid-filled, often haemorrhagic
– Areas commonly affected: Initially face and scalp, then spread to the chest and back
– Nikolsky sign: Usually positive
– Pruritus: Rare
– Skin biopsy: Intra-epidermal deposition of IgG between cells throughout the epidermis

Bullous Pemphigoid:
– Age: Elderly people (mean age 80)
– Oral involvement: Rare
– Blister type: Large and tense
– Blister content: Fluid-filled
– Areas commonly affected: Upper arms, thighs, and skin flexures
– Nikolsky sign: Usually negative
– Pruritus: Common
– Skin biopsy: A band of IgG and/or C3 at the dermo-epidermal junction

Methicillin-resistant Staphylococcus aureus (MRSA) has become a significant issue in hospitals and other healthcare facilities in recent years. MRSA refers to any strain of Staphylococcus aureus that has developed resistance to beta-lactam antibiotics, such as penicillins and cephalosporins. This resistance is caused by the presence of the mecA gene, which produces a penicillin-binding protein with low affinity. Fortunately, MRSA is typically susceptible to teicoplanin, vancomycin, daptomycin, and linezolid. On the other hand, imipenem is an intravenous beta-lactam antibiotic that belongs to the carbapenem subgroup.

Toxic epidermal necrolysis is a severe and potentially life-threatening form of erythema multiforme. This condition leads to the detachment of the dermis from the lower layers of the skin. In some cases, it can result in death due to sepsis and failure of multiple organs.

Stevens-Johnson syndrome and toxic epidermal necrolysis are considered to be different stages of the same mucocutaneous disease, with toxic epidermal necrolysis being more severe. The degree of epidermal detachment is used to differentiate between the two conditions. In Stevens-Johnson syndrome, less than 10% of the body surface area is affected by epidermal detachment, while in toxic epidermal necrolysis, it is greater than 30%. An overlap syndrome occurs when the detachment is between 10-30% of the body surface area.

Certain medications can trigger Stevens-Johnson syndrome and toxic epidermal necrolysis. These include tetracyclines, penicillins, vancomycin, sulphonamides, NSAIDs, and barbiturates. It is important to be aware of these potential triggers and seek medical attention if any symptoms or signs of these conditions develop.

Technetium 99 (Tc-99) pertechnetate scintigraphy is the preferred imaging method for evaluating frostbite. This technique is highly accurate in detecting tissue damage and provides both sensitivity and specificity.

Further Reading:

Hypothermia is defined as a core temperature below 35ºC and can be graded as mild, moderate, severe, or profound based on the core temperature. When the core temperature drops, the basal metabolic rate decreases and cell signaling between neurons decreases, leading to reduced tissue perfusion. This can result in decreased myocardial contractility, vasoconstriction, ventilation-perfusion mismatch, and increased blood viscosity. Symptoms of hypothermia progress as the core temperature drops, starting with compensatory increases in heart rate and shivering, and eventually leading to bradyarrhythmias, prolonged PR, QRS, and QT intervals, and cardiac arrest.

In the management of hypothermic cardiac arrest, ALS should be initiated with some modifications. The pulse check during CPR should be prolonged to 1 minute due to difficulty in obtaining a pulse. Rewarming the patient is important, and mechanical ventilation may be necessary due to stiffness of the chest wall. Drug metabolism is slowed in hypothermic patients, so dosing of drugs should be adjusted or withheld. Electrolyte disturbances are common in hypothermic patients and should be corrected.

Frostbite refers to a freezing injury to human tissue and occurs when tissue temperature drops below 0ºC. It can be classified as superficial or deep, with superficial frostbite affecting the skin and subcutaneous tissues, and deep frostbite affecting bones, joints, and tendons. Frostbite can be classified from 1st to 4th degree based on the severity of the injury. Risk factors for frostbite include environmental factors such as cold weather exposure and medical factors such as peripheral vascular disease and diabetes.

Signs and symptoms of frostbite include skin changes, cold sensation or firmness to the affected area, stinging, burning, or numbness, clumsiness of the affected extremity, and excessive sweating, hyperemia, and tissue gangrene. Frostbite is diagnosed clinically and imaging may be used in some cases to assess perfusion or visualize occluded vessels. Management involves moving the patient to a warm environment, removing wet clothing, and rapidly rewarming the affected tissue. Analgesia should be given as reperfusion is painful, and blisters should be de-roofed and aloe vera applied. Compartment syndrome is a risk and should be monitored for. Severe cases may require surgical debridement of amputation.

Onchocerciasis is a parasitic disease caused by the filarial nematode Onchocerca volvulus. It is transmitted through the bites of infected blackflies of Simulium species, which carry immature larval forms of the parasite from human to human.

In the human body, the larvae form nodules in the subcutaneous tissue, where they mature to adult worms. After mating, the female adult worm can release up to 1000 microfilariae a day.

Onchocerciasis is currently endemic in 30 African countries, Yemen, and a few isolated regions of South America. Approximately 37 million people worldwide are currently infected.

Symptoms start to occur around a year after the patient is infected. The earliest symptom is usually an intensely itchy rash. Various skin manifestations occur, including scattered, red, pruritic papules (acute papular onchodermatitis), larger, chronic, hyperpigmented papules (chronic papular onchodermatitis), lichenified, oedematous, hyperpigmented papules and plaques (lichenified onchodermatitis), areas of skin atrophy with loss of elasticity (‘Lizard skin’), and depigmented areas with a ‘leopard skin appearance, usually on shins.

Ocular involvement provides the common name associated with onchocerciasis, river blindness, and it can involve any part of the eye. Almost a million people worldwide have at least a partial degree of vision loss caused by onchocerciasis. Initially, there may be intense watering, foreign body sensation, and photophobia. This can progress to conjunctivitis, iridocyclitis, and chorioretinitis. Secondary glaucoma and optic atrophy may also occur.

In a number of countries, onchocerciasis has been controlled through spraying of blackfly breeding sites with insecticide. The drug ivermectin is the preferred treatment for onchocerciasis.