Lipoma large red and Infected - green discharge on scalp. (Photos)

This is a cyst and with my experience of being double board certified in dermatology and cosmetic surgery and treating 100s exactly just like yours over 19 years I have never needed to used anything but local numbing.  Rather simple treatment in my opinion and being a prefered provider for all insurances helps as well.  Board certified dermatologist specializing in surgical treatment is key here.

This may represent an inflamed pilar cyst. Surgical excision should be followed by a biopsy path specimen.Best, Dr. Karamanoukian#Realself100 Surgeon

Thank you for sharing your question and photographs.  It appears that you have an infected sebaceous or epidermal inclusion cyst in your scalp which can be treated with excision of the internal contents and surrounding covering.  This can be performed under local anesthesia in an office based setting.  Be sure to see an ASPS board certified plastic surgeon in consultation.

This is a problem and requires wide excision by a plastic reconstructive surgeon with a flap to cover. Go to a university hospital for such care.H Karamanoukian MD FACS

Thank you for your post. It appears to be a cyst and not a lipoma. Removal in the office with local anesthesia is usually the treatment. Benjamin J. Cousins MD 

Likely you have an infected scalp cyst; we treat these routinely and it does require I and D then excision of the cyst shell 5 days later; insurance does cover this procedure and yes it can be done in the office.