
Red Bruise Appeared On The Shaft Of Penis. Should I Be Worried?

Welcome to healthcare magic.
Thank you for your query.
The redness on the shaft of the penis may be due to various causes.
Allergic reaction from a detergent & washing powder is one of the possibilities.The clothes cleaned by these substances, when come into contact with your body, may cause allergic irritation.
Yeast infection should be considered also. It may be transmitted from sexual contact. It may cause similar symptoms described by you. It can be treated with anti-fungal cream.
Lubricating agent used during masturbation may also cause some irritating reaction.
Sexually transmitted disease should also be considered.
It is better to see a physician to get examined and investigated for these causes.
He may prescribe a medicine depending on the cause.
Hope I have helped with your query. Let me know if I can assist you further.
Take care.

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