What does a large lump on penis shaft indicate?
This is most likely a insect bite
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I have inspected all three attached pictures and feel that your suspicion about insect bite is correct. I agree with you that no bite mark is visible but it is not necessary. After development of edema (lump) it is very difficult to locate bite mark. The consistency may be like fluid or gel at various stages of edema.
The acute development (over night) does not indicate to any kind of infection. The location of lump ( distal shaft) is also more consistent with insect bite.
Please observe the size of lump. Generally lump due to insect bite start reducing in size within 48 hours. If its not showing any sign of reduction till date than the other posdibility need to be explored.
As you said there is no symptom other than lump wait and watch strategy can be applied.
Hope I answered your query and if you feel to ask anything more about this I will be happy to assist you.
Thanks and Regards
If it is not an insect bite, do you have any other ideas as to what it could be?
This could be Chancre or FDR
Thanks for reverting back to me.
Other than insect bite it can be a chancre if you have unprotected sex in recent past. The point against is its size and location. Chancre generally smaller in size and apper more proximal. Other than this they do not cause any discomfort.
The next possibility is FDR ( fixed drug reaction)if you are receiving any medication.
The third possibility is traumatic while putting on trouser zip but you have not mentioned any such history.
To conclude other possibilities depend on availability of collateral history which is lacking in your case, so most likely it is a insect bite.
" If you have no more clarifications you can close the query and rate the answer."
Thanks and Regards
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