I'm sorry to hear about the painful pimple on your neck. Here's what you can do to help manage it:

• Keep the area clean: Gently wash the affected skin twice daily with a mild cleanser and lukewarm water.
• Avoid touching or squeezing: Picking or squeezing the pimple can worsen inflammation or cause infection.
• Topical treatment: You may consider using a topical gel containing clindamycin and nicotinamide, which helps reduce bacteria and inflammation. For example, a gel like Acnestar Gel can be applied in a thin layer over the pimple after washing your hands. Avoid contact with eyes, mouth, or other sensitive areas.
• Moisturize and hydrate: Use a gentle, non-comedogenic moisturizer to prevent dryness and drink plenty of water.
• Sun protection: Avoid excessive sun exposure and apply sunscreen if you go outdoors.

If the pimple worsens, becomes very painful, shows signs of spreading infection (such as increasing redness, warmth, swelling, or pus), or does not improve in a few days, please consult a dermatologist for further evaluation and treatment.

If you experience severe symptoms or signs of systemic infection (fever, chills), seek immediate medical attention.

Take care and monitor the area closely.To narrow down potential causes, we will need some more information.Please tell me if you are male or female.