Bottom sole of my right foot just below the heel fees numb?

Bottom sole of my . You might have a compression of a small nerve that runs from the inside of the ankle underneath the heel. See your podiatrist for proper diagnosis. The cause could be trauma, flat feet, improper flat shoes, l4l5-s1 spinal compression/herniated disc.
Could be a localized. Numbness, or tarsal tunnel, or possibly something higher up like your lower back, or possibly even a symptom of a systemic disease ( though that is usually symmetrical).
Possibilties. Plantar fasciitiis, inflamed or entrapped nerve and heel spur are the most common reasons. Low back conditions may also cause this symptom.