It's concerning that the lump under your chin has persisted for 3 months without any improvement, even after taking antibiotics. There could be various causes for a lump in that area, such as an infection, cyst, or swollen lymph node.

I would strongly recommend scheduling an appointment with a general practitioner or a dermatologist, who can evaluate your situation thoroughly. They will be able to perform a physical examination, ask you relevant questions about your symptoms, and may order additional tests or imaging studies if necessary.

In the meantime, try not to touch or manipulate the lump, as this can potentially worsen the condition or introduce an infection. Also, pay attention to any symptoms you may be experiencing, such as pain, redness, or changes in size, and share these details with the healthcare professional during your appointment.

Remember, only a qualified healthcare professional who examines you in person can provide an accurate diagnosis and recommend appropriate treatment options.

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