Dry, cracked, inflamed penis underside

Hello, I wonder if anyone could help - I have had dry skin under the shaft of my penis on and off for a while now. Unsure if this is a skin condition or an STD of sorts. It doesn't hurt or itch just looks unsightly. My lifestyle may be in play here as I am a heavy drinker and abstained for a week and it cleared up completely - however, I need advice if this is herpes or something and needs medication to shift it for good as i don't want to give it to anyone when it's dormant as it were.

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I can only help you with the appearance of your skin - if you feel you have potential STD issues go get tested at a Sexual Health Service.
When you say you abstained for a week - there may be to accompanying issues: you may not have been sexually active at the time / or have masturbated during the same period; and, how you wash your penis can be linked to the cracked and inflamed skin
Do you wash you penis with soap and things like shower gel?
I am guessing you have never tried using Liquid Coconut Oil … ?