Papulosquamous diseases Flashcards
What is the gold standard for the diagnosis of tinea versicolor?
KOH (hydrogen peroxide) stain
What is the treatment for tinea versicolor?
Topical antifungal medications (selenium sulphide, fluconazole, ketoconazole).
What is tinea versicolor?
It is a fungal skin infection which interferes with the normal pigmentation of the skin.
What is the name of the organism that causes tinea versicolor?
Malassezia Pityrosporum
What are the most common drug eruptions?
- Urticarial drug eruption
- Morbilliform drug eruption
- Fixed drug eruption
- Lichenoid drug eruption
What are the causes of Morbilliform drug eruption?
- amoxicillin
- beta- lactam antibiotics
- sulphonamides
- allopurinol
What is type of reaction is morbilliform?
Type IV hypersensitivity reaction and it occurs 2 weeks after the drug is started.
What is the definition of Lichenoid drug eruption?
- Purple, pruritic, polygonal plaques. (4 P’s)
- May be seen in the nails but not in the oral mucosa
- It occurs 2 months after starting medication
What are the causes of Fixed drugs eruptions?
- paracetamol
- sulphonamides
- tetracycline antibiotics
What is the definition of fixed drug eruption?
Circular, erythematous rashes containing a blister usually pigmentation remains after healing.
What type of reaction is urticarial?
Type I hypersensitivity reaction
What is the definition of urticarial eruption?
Itchy, red wheals with angio - edema that can change form. Diagnoses is made with skin prick test and management with anti histamines.
What are the causes of urticarial eruption?
NSADs, beta - lactam antibiotics, ACE - I, opiates.
What are the causes of Lichenoid eruption?
- ACE- I
- BBs
- Thiazides
- antimalarials
- penicillamine
What is psoriasis?
Psoriasis is a non contagious, chronic, autoimmune inflammation characterized by erythematous SCALY plaques.
