Suggest Treatment For Ulcers And Peeling Skin On Bottom Lip

i have swallon ulcer type dots on the inside off both cheeks after first having a large blister that went from inside my mouth out onto my bottom lip. this was six weeks ago and i still have swelling and ulcers in my mouth and my lips have pimple type things that appear to be under the skin. i went to doctor and was given anti fungal treatment twice which has done nothing. it is very painful and i cant eat much due to this. on my bottom lip, the skin just kept peeling off and it would leave deep pin sized holes everywhere then peel again. please help my doctors keep telling me they dont no what it.