Hello! my question is regarding an ulcer/blister like lesion on the border of my lip. it hurts a little, could it be herpes labialis? or nutrition def

Watch it: It could be anything from your first episode of herpes labialis to a minor forgotten injury to a plugged duct of a lip gland. "nutritional deficiency" is unlikely -- this kind of idea comes mostly from the shadow-world of overpriced vitamin ads. However, if it's painful cracks at the corners of your mouth, this may indeed be iron or (less likely) vitamin deficiency. Good luck & thanks for asking.

Many possibilities: There are many types and causes of skin blisters or rashes. Several types of inflammatory conditions of the skin, allergic reactions, and sometimes bacterial, viral or fungal infections and insect bites can cause blisters on the skin. Have it evaluated by a professional and get the appropriate treatment.