Unknown chemical burn

rashes over shoulder and forarm of 16 yr boy!! c/O pain and itching since 5 days adv: clobenate Gm d/d??

45 years Male, intense itch multiple vesicles in right side neck and behind the ears since 3 days. mild burning is there. no fever and no body pains.diagnosis? How to manage this case.?

35 yr male pt treated with acyclovir 400 BID for 5 days by non-clinical person

42 y/o male with no significant medical history presented with oral ulcerations x 1.5 weeks. Ulcerations initially scattered in only 3 to 5 mm, increasing in size until they coalesce together into one large ulcer (as seen on the hard palate) + submandibular lymphadenopathy, no fever, no other sx. Has had recurrent episodes, always unilateral, sometimes only on the lateral aspect of the tongue, subsequent episodes always with increased pain and ulcer size. Any ideas? Apthalmous ulcer? Oral shingles (doesn't cross midline)? Vitamin B-12/folate deficiency?

patient has fever since 2 days ! rash since 1 day! what is the diagnosis?