Skin biopsies of this rash reveal keratinocyte acantholysis

[Medicoman]

Skin biopsies of this rash reveal keratinocyte acantholysis. What is the most likely diagnosis?

1. Pemphigus foliaceus
2. Psoriasis vulgaris
3. Seborrhoeic dermatitis
4. Subacute cutaneous lupus erythematosus