Lesions appeared out of no where on penis. Is this an STI?

These wound marks appeared a few days ago when I woke up. I have no explanation for this, could it be an STD? I'm really worried... I have been tested 1 month ago (negative) and only have been sexually active with my only partner the last few months. Images:

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https://ibb.co/N15P0MN https://ibb.co/Yh5JQQM