Bumpy and red on the back of the neck~ The dermatitis isn't healing.

Initially, a red, rough, and scaly thing appeared on the back of my neck.
When I applied the eczema ointment, it got a bit better, but then it itched, and I kept touching it.
When a scab forms, peel it off, it itches, scratch it, and apply medicine~
I woke up in the middle of the night and noticed that I had bled a little because I must have touched my hand too much without realizing it.
As this happens repeatedly, my skin has become thicker and dermatitis is spreading more extensively.
How should I manage a skin dermatitis that isn't healing properly?