Hello Doctor,
I am suffering with scalp problem since few weeks.
I found red pimples and loss of hair too.
Could you please give me a solution?

There are 100's or more reasons for this to happen. The skin needs to be looked at locally, maybe even samples tested. You MUST see a local doctor for this.

There are no doctors on this site. Any medical issue, especially one this severe, must be seen to by an actual doctor, in person.