Case Number : Case 2909 - 31 August 2021 Posted By: Saleem Taibjee

sub corneal pustule with basal cell vacuolar changes with some spongiosis and lymphocyte exocytosis.  A few necrotic keratinocytes are there in epidermis. I don't see eosinophils in dermis or vascular damage

could it be a drug rash/AGEP. It needs CPC

Could well be psoriasis or AGEP. But I would also do a DIF for IgA pemphigus where acantholysis may be inconspicuous leading to deceptive histology mimicking psoriasis. Would also do PAS to exclude Tinea. 

I think i can see some fungi and spores,  i would do PAS first 

Need PAS to verify fungi. Agree with Volva.

Fungi. 

Yes, you guys are too good. Despite the unusual aspect of additional interface component to the inflammation in this recent case which I had not come across previously and I thought might throw you, this is indeed tinea. Please see PAS images below.

BW
Saleem