 [ Symptoms ] i got 2 perfect round completely red circles on my back possibly ringworm occasionally i get an itch but nothing bad  i noticed the other day i had 2 completely red perfect circles on my back they look to have really little pimples maybe blisters on them my first thought was ring worms but i havent seem and thats completely red most have a ring like fade to them although i have read it can be solid red havent had any sickness or anything with it just an occasion itch but rarely brother thinks maybe masquito bite but i just wanna make sure so if i know to buy the cream or what not  [ Disease ] yes an infected tooth especially the molars can cause a muscle tension type headache that does not imply however that the cause of your headache is a dental source    there are many causes and types of headaches you would need to consult your medical provider or dentist to make that association