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My boyfriend has a skin condition called PLC (Pityriasis lichenoides) he is 25 and when he doesn't get enough sunlight (vitamin d) his skin break out in little red dots. The aren't itchy, maybe a little dry but they come mostly under his arms and on his back

check out this site for info:

http://dermnetnz.org/scaly/pityriasis-lichenoides....

Galeodus bite (Wall Spider) causes red patches after the fluid pebbles break ,usually on fore arm and legs. Insect bites can be cleared with onion salt juice therapy for 10 minutes before bath two times a day .

could indicate a circulation problem if it's discoloration of the skin. If you have a pre-existing heart condition, and this is new, then perhaps a trip to the doctor is in order?

could b psoriasis