Itching on my back and chest, is it treatable?

Hello. Is it because of the season?

I am contacting you because I have been experiencing severe itching on my back and lower chest recently.
Itching causes you to unconsciously scratch, and the skin becomes red and marks remain, which is very uncomfortable.

I thought it was due to dryness, so I tried moisturizing, but the symptoms did not improve and instead, the itchiness got worse at night, which disturbed my sleep and damaged my skin.

I am wondering if this itching that appears on the back and lower chest area is also something that can be diagnosed and treated.

If treatment is possible,
I am wondering if any tests or diagnostic procedures will be done to determine the cause of the itching.
I would appreciate it if you could let me know what treatments are available for these symptoms.
Also, can I get a prescription and go through a self-treatment process at home (medication, ointment prescription, habit improvement, etc.)
thank you!