there is no sores or blisters of any sort on the tip of my penis. the red streaks slowly appeared was urine and blood tested all negative. i am going to get tested this week again. what could it be ?
Markus, if you are meaning the cracked appearance - similar to that you get with old leather on furniture, this is not caused by and STD. I cannot see any red spots that are different to this, however, if you have recently had unprotected sex this can further aggravate the sensitive skin on the head of the penis.
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Most issues like this are caused by the skin on the head of the penis losing its natural Ph balance and this is most likely caused by years of exposure to soap and other body cleansers such as shower gels and lotions and body wash.
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The skin of the head of the penis is very sensitive to anything that is chemical based and this can even include things like normal skin creams, lotions and moisturisers as the vast majority of these are petroleum oil based.
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The best thing to do is wash your penis, particularly the head area, with water only. To begin to re-hydrate your skin you need to use something that is a plant extract - the best ones to use are Aloe Vera Gel and Coconut Oil, both of which are relatively cheap.
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Simply apply a light coating of one of these 4 or 5 times a week until you see a clear improvement …