What Causes A Buttock Spot With Irritation?

hi, well i have recently got a white dot on my ass it looks a bit like a pimple, my bum has been feeling a bit irratated, i have gone to the doctor and she said that it might be a blocked gland, im not sure... i have been with one partner for 5 years, i have recently been to a festival where i used portaloos can that cause it?