My 3 year old son has a very hard pimple like thing on his stomach area. It has not grown in size since almost 2 months. It is very hard to touch and does not have any pus. I even tried to puncture it 1 month back but it was as hard as a stone. I consulted 2 pediatricians but none of them could help. One of them prescribed a cream named FUCIBET but it could not cure the pimple l. Whom should I consult for this - a dermatologist or a surgeon.