I have been taking 30mg prednisolone daily now for 4 weeks and for the last 10 days or so I have had about a dozen of these lumps come up on my arms and torso. They start off by looking like little bites, then go all red on the outside and bumpy a day or two after then with a big white head on a couple of days after that. Any ideas as to what these are and if the tablets are causing them?