I am experiencing skin rash over finger joints. i am not sure if its a rash but i have tiny raised bumps under the skin of my middle right finger and also less bumps on my index and ring finger. the bumps are red and white and very small. ?

As you can imagine a rash needs to be seen. There are several types of rashes. You can try a telemedicine visit.

Sounds like dyshydrotic eczema, which presents as very small confluent vesicles on the fingers. Sometimes they tend to itch and eventually dry out and disappear. However, you ought to visit a dermatologist to confirm this dx and receive the proper tx.