This could represent ischial bursitis or proximal hamstring-origin tendinopathy, as both can cause pain over the “sitting bones” that worsens with sitting, stretching or exercise. However, distinct mobile lumps are not enough to diagnose bursitis and may represent bursal swelling, cysts, lipomas or another soft-tissue lesion.
Please get an orthopaedic consultation. A neurological examination and examination of the hamstring attachments are also needed. Ultrasound of both ischial regions would be a reasonable initial investigation; an MRI pelvis may be required if the lumps are deep, the ultrasound is inconclusive or hamstring-tendon involvement is suspected.
Next Steps
Avoid prolonged sitting and hard surfaces; take frequent standing breaks.
Use a pressure-relieving cushion that unloads the sitting bones.
Temporarily stop hamstring stretching, glute exercises or massage that reproduces the symptoms.
Continue gentle, pain-free walking and use ice for 10–15 minutes after aggravation.
Avoid injections into the area until the diagnosis is confirmed.
Health Tips
Because you previously experienced buttock/perineal numbness, seek emergency assessment immediately if it returns or worsens, particularly with difficulty passing urine, loss of bladder or bowel control, altered genital sensation, sexual dysfunction or increasing leg weakness. These can indicate significant compression of the lower spinal nerves