Hey, you've probably gone to the doctor and solved your problem by now (I hope). But I want to tell you it would be rare for cherry angiomas to suddenly appear and itch and spread. Mosquito like spots after sex can be SCABIES, which can be spread from one person to another. A doctor can prescribe medicine to kill it.
Hi,
Cherry angiomas are benign , fairly common skin growths that vary in size. They can occur almost anywhere on the body but usually develop on the trunk.
They are most common after age 40. The cause is unknown. Although painless and harmless, cherry angiomas may bleed profusely if injured.
http://en.wikipedia.org/wiki/Cherry_angioma
Cherry angiomas generally do not need to be treated. If they are cosmetically displeasing or prone to bleeding, angiomas may be removed by surgery, freezing (cryotherapy ), burning (electrosurgery/cautery), or laser.
Let us know if you need any other information.
Regards.