<s>[INST] Hi there, I have had a mole like bump on my arm for a couple of years now and the majority of the time it is normal (slightly raised) but every month or so its swells ( as if it is filled with fluid) it is bery hard and it gets a white ring around it, around the white ring the skin is red and looks aggravated. The thing is it only stays like it for a few hour and then in goes back to normal. thanks [/INST] Hello!Thank you for the query.If any mole acts like that (changes size, color, borders) should be removed and tested. We call such mole suspicious. There is no other treatment than its removal.So please do not wait with it. Consult dermatologist or general surgeon and have it removed.Hope this helps. Regards. </s>