In the absence of any sexual activity, this does not sound like an STD .Also, with the way you described the skin condition, this does not seem to be cancer. Cancerous lesions may appear as discolored or hyperpigmented areas. In your case, you have mentioned that the dots are present on the glans penis and it has shown some scabbing now. You are also young and cancer in this age group is rare especially cancers involving the genitalia which are not very common.
This may be a case of balanitis. Refrain from manipulating the area. Continue to observe the condition. Microscopic evaluation of the scabs may help as this may be fungal infection.
This does not sound serious since this has been present for quite sometime and this does not present with evident discomfort, scaling, itchiness or pain. Refrain from manipulating the area. At this point, we can not be sure what these are. They do not sound infectious. Continue to observe these and do not apply any cream or lotions as these may only aggravate the condition.
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