"GP was dismissive and abrupt"

I phoned my GP regarding a rash I have developed in my armpit, a suspected lump and pain in both my breast and armpit that I have been experiencing over the week. In general, I struggle with phoning the GP practice anyway because of how unwelcoming the receptionists have often been. This time I thought it would be serious enough to ask for a telephone appointment, and I was asked to submit a photograph of the rash I have (I did not of my breast but of my armpit only as I felt too uncomfortable doing both). I received a phonecall from a GP (not the usual person I see) saying this was just folliculitis and nothing to worry about, just a cream was prescribed.

I am worried still about the risk of something more sinister -  and am shocked and surprised that despite my probing of a suspected lump and pain in my breast that this apparently is just a spread of folliculitis. I often feel at my GP that I am dismissed because I am a young female, and often it has taken more than one call to be taken seriously about symptoms that often cause me severe anxiety. Surely an examination of some description to rule out something more sinister was also warranted, given I suspect a lump?

I would change practice however there are few in my area, and I fall outwith the catchments for the closest ones - which I find is most inconvenient. There is also no way to find out on the NHS website if a practice is taking new patients, or if I am able to register there - essentially one has to ring round all the ones that are brought up in search to determine if you can register there or not.