What is this; hard, purplish, red center, bump, on the shaft of my penis? i can send a photo as well. thank you

Check it with doctor: Could be infection/ STD Could be simple skin lesion or cyst You need proper exam and assessment

More info needed: If it has been there for months or years, then almost certainly it is some sort of anomaly like a hemangioma or sebaceous cyst. If more recent, maybe just a pimple or a sebaceous cyst that became infected. Either way, it doesn't sound particularly serious. For example, this doesn't sound typical for any STD. You'll need to see a doctor, or consider signing up for HealthTap's Concierge service.