In late October last year I saw a tiny red circular dot on my rib cage, didnt think much of it possibly was a mosquito or spider bite. In mid November the dot began growing under the skin to a pinky size dot, was somewhat hard under the skin. December is when it got reddish purple, was tender, and grew to dime size. Last week I was seen by my family doctor who prescribed an antiobiotic and I was to return for her to check it in two week.  Just one week later (last week) I went back to her, it is  now the slightly larger than a quarter and is very tender, painful even when I try to lay on it to sleep.  I had an ultrasound last night and am waiting for results.  The doctor wants me to have this surgically removed.  Should I consult a dermatologist first?  Im taking Cephalexin antibiotic but it hasnt helped.  Recommendations?
Hello rearward welcome to Chat Doctor.come have evaluated your query in details .* Most possible reason is inflammation in the cyst type lesion. Must get surgeon's opinion rather than dermatologist. Hope this clears your doubt . Wishing you fine recovery. Welcome for any further assistance. Regards take care.