Hi,Welcome to HCM.
Based on the facts of your query,the painful black lump in the top of the butt crack,which used to itch,but lately with yellow discharge,with a hole there,and today blood discharge,could be due to a-Acute on Chronic
Furuncle in the butt crack/or could be due to Pilonidal infected and burst Cyst.
The only thing to worry is the black lump above your anus,which got infected.In that case I would suggest you to take
Second Opinion and
Consult Dermatologist /and Surgeon to rule out the
melanoma with a infected pilonidal cyst/or furuncle underneath it.
Till the time you get confirmations about the cause of this lump,assume it as infective treatable lump,which your Surgeon would treat it by proper antibiotics/Tab Motrin/and proper surgical
drainage with proper dressings over next 10 days or so.
Biopsy of the black skin with HPR report would resolve this ambiguity and worry.
This reply would resolve your current issues and would reduce your anxiety with it.
Hope this reply would help you to plan treatment with your doctor.
Will appreciate your Hitting thanks and writing excellent review comments to help needy patients like you.
Welcome with any other further query in this regard.
Good Day!!
Dr.Savaskar,
Senior Surgical Specialist
M.S.Genl-CVTS