Onychophosis is the most common cause of pain in the nail sulcus. It is commonly mistaken for an ingrown toe nail. The pressure from the nail results in a build of of skin and it is that thicker skin in the nail groove that causes the pain. The treatment of onychophosis usually will need the skills of a podiatrist to expertly debride the callused nail groove and remove the painful skin.
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Onychophosis is a medical condition characterized by the accumulation of hyperkeratotic tissue—basically thickened skin—within the nail folds, especially the lateral (sides) and proximal (base) parts of the nail. This thickening usually occurs due to chronic irritation, repeated minor trauma, pressure from ill-fitting footwear, or mechanical stress. The condition is especially common in older adults and individuals with poor foot biomechanics, and it’s often associated with other nail disorders like onychomycosis (fungal nail infection) or nail plate deformities.
Clinically, onychophosis presents as thickened, yellowish or grayish skin that builds up beside or beneath the nail. It might be accompanied by tenderness, pain when walking, or discomfort during nail trimming. In severe cases, the tissue can compress the nail matrix or bed, causing secondary nail distortion or even infection. While it’s non-malignant, its chronic and progressive nature can significantly affect quality of life, especially in those with diabetes or compromised circulation, as it increases the risk of ulceration and infection.
Management of onychophosis involves a combination of mechanical debridement (careful trimming or grinding of the thickened tissue), offloading pressure (with better footwear or orthotic support), and addressing underlying causes. In podiatric care, routine debridement is often done to provide symptomatic relief. Preventive care is also key—regular foot hygiene, avoiding tight shoes, and managing systemic conditions like diabetes can help reduce recurrence. In persistent or painful cases, referral to a podiatrist or dermatologist may be necessary for more targeted treatment like keratolytic agents or minor surgical intervention.
Resources:
Not an ingrown toenail? (Podiatry Experts)
Onychophosis (PodiaPaedia)
Ingrown nail or Onychophosis? (Croydon Total Footcare)
The side of the toenail hurts, but its not ingrown (Podiatry FAQ)
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