Clinical photography of bilateral plantar feet demonstrating characteristic pits of pitted keratolysis. This in vivo image captures the sole surfaces, primarily the weight-bearing plantar aspect from midfoot to toes, with a close-up view of the skin. Visual features include multiple shallow, punched-out depressions (1–3 mm) scattered across the plantar epidermis, well-defined circular to oval pits with smooth rims, and surrounding hyperkeratosis or desquamation. The intervening skin shows minimal erythema and subtle fissuring in flexural areas; overall texture is dry-to-moccasin-like. The pattern is bilateral and symmetrical, more pronounced on pressure-bearing regions. These pits result from superficial cornified layer loss and bacterial activity, classically due to Corynebacterium spp., and are often associated with hyperhidrosis or occlusive footwear in humid environments. Clinically, this finding is highly suggestive of pitted keratolysis and helps distinguish it from tinea pedis, plantar warts, and irritant dermatitis; differential diagnoses include keratolytic plaque and moccasin foot. Diagnostic significance lies in targeted therapy: topical antibiotics (erythromycin, clindamycin, or tetracycline) or antiseptics, improved foot hygiene, drying strategies, and breathable footwear. Potential clinical use cases include dermatology teaching, disease documentation, and electrodermal research on bacterial colonization of hyperhidrotic plantar skin. Clinical utility.

Clinical photograph of the plantar surface of the foot demonstrating classic pitted keratolysis. The image captures white, macerated, moist keratoderma with shallow, punched-out pits distributed across the weight-bearing sole, most prominently in the central metatarsal area. The surrounding skin shows mild erythema and desquamation; there is minimal scale at the periphery. This condition results from superficial bacterial decomposition of keratin in occluded, sweaty skin, commonly Corynebacterium species, and is favored by warm, moist environments and occlusive footwear. The pits appear as small depressions that may drain or secrete moisture; the lesion lacks true vesicles, purulence, or significant inflammatory infiltration. Clinically, pitted keratolysis is differentiated from tinea pedis by its characteristic pits rather than annular scaling; interdigital involvement is common; interdigital maceration may be present. Diagnostic significance lies in recognizing moisture-associated superficial infection, which responds to improved drying, antiseptic washes, and topical antibiotics. Potential clinical use cases include diagnostic aid in dermatology education, teledermatology triage, and differential diagnosis for plantar pits and maceration. This image provides educational reference to correlate appearance with microbiologic etiology and to guide management, including hygiene modification, barrier protection, and targeted topical therapy. These features reinforce a moisture-based bacterial etiology.

Plantarly focused clinical photograph illustrating pitted keratolysis on the ball of the foot. The image is a close‑up plantar view with natural color balance, designed for dermatology documentation and teaching. Multiple shallow, crater‑like pits (1–3 mm) are present in the weight‑bearing stratum corneum, often with surrounding mild hyperkeratosis and intermittent maceration between pits. The pits have well‑defined edges and show minimal surrounding erythema, indicating superficial epidermal involvement without deep ulceration. No nail or interdigital involvement is evident in this view. The distribution is concentrated to the plantar ball region and may be unilateral or bilateral depending on shoe wear and moisture. Pathognomonic features include cratering pits in a moist, occluded environment, frequently accompanied by odor and mild pruritus. Pathogenic mechanism involves superficial bacterial keratolysis caused by Corynebacterium species that secrete proteolytic enzymes in humid conditions. Clinically, these findings differentiate PK from tinea pedis, plantar warts, callosities, and interdigital dermatitis. Diagnostic significance lies in rapid recognition and referral for topical antibiotics and drying measures. This image provides an educational reference for diagnosis, differential diagnosis, and management planning, including topical keratolytics (salicylic acid, urea) and antibiotics, plus moisture control. This photograph supports dermatology education, teledermatology review, and research on plantar dermatologic infections. Correlation with symptoms guides treatment and prognosis in affected individuals.

Clinical photograph of the plantar aspect of a foot highlighting interdigital spaces demonstrates classic pitted keratolysis manifesting as multiple shallow, craterlike pits in the stratum corneum between the toes and along the toe margins. The surrounding epidermis shows focal mild hyperkeratosis and subtle maceration with a waxy, pale appearance. The lesions are primarily superficial, non-erythematous, and do not form frank ulcers; the pits vary in size and are often arranged in clusters within web spaces. The appearance is characteristic for interdigital pitted keratolysis, a superficial bacterial infection caused by Corynebacterium spp. that thrives in moist environments. Clinically, the condition may be accompanied by mild odor and discharge in advanced cases, though odor is not a visual finding in the image. Pathogenesis involves keratolytic enzyme production leading to focal degradation of corneocytes, with epidermal involvement limited to the stratum corneum and granulosum. Diagnostic significance lies in distinguishing this entity from tinea pedis and eczematous interdigital dermatitis; management typically includes topical antibiotics or antiseptics and measures to reduce moisture and occlusion. This image is suitable for dermatology education, medical student training, and clinical reference libraries; it supports differential diagnoses, patient counseling, and treatment planning for interdigital foot skin infections and hyperhidrosis-associated dermatoses.