So, it'll help if only at a causal level. For something that targets the itching and other associated symptoms, we'd probably look to herbal treatments. If I were treating you, I'd ask you a bunch of questions to determine just which aspect of the Liver is responsible for this condition in you. The Liver is said to be especially sensitive to stress and pathologies that are stress induced are usually some form of Liver problem. This is not the Liver that filters blood as we've learned from Western medicine, but the Liver that circulates the Qi energy in the body, the Liver that stores the blood and the Liver that gives rise to internal wind.
Wind has a unique symptom of itching, when it is lodged beneath the skin.
The atrophy situation is not something that I can explain at this time. But that's only for now. Probably it has to do with a Liver Blood deficiency giving rise to the dermatitis. Blood is said to nourish the skin in Chinese medicine. My suspicion is that the Liver blood deficiency is effecting the functional activities of the muscles that are nourished by blood in the Liver meridian which just so happens to pass through the genitalia.