💡 Psoriasis = Auspitz sign, Munroe microabscess. Lichen planus = 6 Ps, Wickham striae.

💡 Pemphigus = Intraepidermal, flaccid, Nikolsky +. Pemphigoid = Subepidermal, tense.

💡 Primary syphilis = painless chancre. Chancroid = painful ulcer.

💡 Ridley-Jopling: TT→BT→BB→BL→LL. Tuberculoid = paucibacillary, well-defined patches.

💡 KOH mount for diagnosis. Tinea capitis = endothrix/ectothrix. Pityriasis versicolor = spaghetti-meatball.

💡 SJS = <10% BSA. TEN = >30% BSA. Carbamazepine & Allopurinol = common culprits.