<s>[INST] I have a mole looking spot on my upper back it sometimes feels tender but doesn't really bother me but it seems to be getting larger and when I touch it, it feels as if there's pus in it and seems like its ready to pop. What could it be? Should I see a doctor about it? [/INST] Hello!Thank you for the query.If it is a dark like a mole, it can be a mole which has started growing. In such case, the mole should be removed and checked for possible melanoma malignum.If the lump is tender, swollen and painful, small abscess due to sebaceous cyst is possible. In both cases you should see a surgeon. If it is a mole, please do not wait with it.Hope this will help.Regards. </s>