 [ Symptoms ] i got a tattoo on my forearm and a hard lump formed under my skin it was painful but not any longer what is it  the lump formed 2 days after i got the tattoo and it was painful to the point where i had to keep my arm elevated because if i lowered it i felt a shotting pain up my arm and tingling also the pain went away after 3 days but the lump is still here after 6 months what should i do and what is it [ Disease ] i am sorry you experienced this and hope it has cleared up by now rashes can be caused by many things one important thing to remember is this if a rash is accompanied by swelling of the throat or difficulty breathing it is time to call 9 1 1 these could be the symptoms of a rare life threatening allergic reaction luckily most rashes are not life threatening this webmd symptom checker for skin rash can be helpful in figuring out what is going on with you if your rash has not gotten better by now your best bet is to see a doctor he or she can help figure out what is going on and treat it if necessary best wishes to you