 [ Symptoms ] my 3 year old son fell and his tooth went through his bottom lip do i need to take him in [ Disease ] hi ok this burning in your vagina inside or outside you should get back to your doctor its a side effect that is not down is this burning all the time or just straight after sex if this burning is deep inside your vagina straight after sex then in could be your bf is sperm if this is the first time you two have been having unprotected sex together so try having sex with a condom on an see how that goes and now the acid test sex au natural if it burns its his sperm it has a high acid content he will need to have it tested could be just done to what he eats and can be put write do hope this helps good luck