Hi there!
I see you're on 6MP - that is one of the side effects. I usually get them on my forearms. They raise up like a blister sometimes. Other times it looks like I must have hit my arm or something. Don't worry, they disappear after about a week or so. I also got them on the inside of my lip shortly after starting them.
Other side effects are nausea, mild gastro (vomit, diarrhoea, loss of appetite, abdominal pain); mouth ulcers; jaundice (skin or whites of eyes turn yellow); rash, fever or an infection; unexpected bruising or bleeding, hair loss (noticed that after about 3 months but has now stopped);
If you get any of the following you need to see the dr immediately:
wheezing, swelling of the lips/mouth; difficulty in breathing, hayfever, lumpy rash (hives) or fainting (could be symptoms of an allergic reaction). However I found that they tested my TMP levels as that can tell them whether or not you can take the drug.
Hope the above info helps
Cheers
B