A mosquito bited me a couple houres ago , it got swollen and purple. is that dangerous ? because i'm afraid of the purple bruise

Should be okay: Some people react to mosquito bites with bruising. It is not dangerous. If you develop fever or other symptoms then you need to see a doctor but the bruise will go away on its own.

Bite : It may or may not be s bite. Sometimes people get a skin infection or malady they attribute to a bite but sometimes is not a bite. See a physician if you have itching or if the area is painful hot or swollen. It may be an allergic reaction. Good luck.