Red Rash-looking spots on penis head, very worried

I just now noticed my Penis has this red rash on the head and i'm so very worried. earlier on in the day I came in sexual contact with someone but my hand is the only thing that came in contact with their genitals. Problem is, i touched my genitles with that same hand. just hours later, i noticed this rash on my penis and cant help but think its an STD. i am uncircumsized and ive have similar red spots in the past just below the penis head but never on the penis head itself. i even got an STD check when that happened and they told me it was just irritated from the heat. im gonna get tested asap but for now can anyone please tell me what this looks like? I Could really use some piece of mind. it doesnt burn or itch at all.

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Brad, it is likely that you have some relatively minor irritation that will clear given time. For your own peace of mind do get tested as you suggest. In the mean time here is some information on mutual masturbation from a reliable medical source:
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Mutual Masturbation and Sexually Transmitted Diseases

Mutual masturbation is when you and a partner sexually arouse each other using your hands. It can also involve you each masturbating, but near each other. In general, mutual masturbation is relatively safe sex. That’s particularly true if no bodily fluids are transmitted.

There are, however, ways to make mutual masturbation even safer. If you are touching your genitals, you can wash your hands before touching your partner’s genitals—or vice versa. You can also consider using gloved hands to touch your partner and bare hands to touch yourself. Either one of these things makes it less likely that you would spread an infection between you.

In general, STDs that spread through bodily fluids—such as HIV and chlamydia—are relatively unlikely to be spread through mutual masturbation. There’s a bigger risk for STDs that spread from skin to skin, such as herpes and molluscum.