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Tinea Nigra Palmaris

To identify the key insights or developments described in this article
1 Credit CME

A man in his 20s presented with a 2-year history of slowly increasing, asymptomatic dark spots on his left palm. On examination, there were multiple coalescing brownish black macules with irregular borders over the left palm and palmar aspect of the digits, with black pigmentary accentuation over the creases. They were devoid of any scaling or signs of inflammation (Figure). A direct microscopic examination (DME) on potassium hydroxide (10%) mount revealed brown branched septate hyphae. A culture in Sabouraud agar revealed brownish black wet colonies after 1 month of inoculation at 21 °C. A diagnosis of tinea nigra palmaris was made, and he was treated with topical azoles and keratolytics with excellent response and resolution within 2 months of therapy.

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Article Information

Corresponding Author: Sushil Kumar, MD, Department of Dermatology, Military Hospital, Prayagraj, Uttar Pradesh 211002, India (dmt5861@gmail.com).

Published Online: October 26, 2022. doi:10.1001/jamadermatol.2022.4442

Conflict of Interest Disclosures: None reported.

Additional Contributions: We thank the patient for granting permission to publish this information.

References
1.
Perez-Tanoira  R , Olivo  CZ , Alen  JF ,  et al.  Tinea nigra palmaris: a clinical case in a rural Ethiopian hospital.   Rev Inst Med Trop Sao Paulo. 2018;60:e52. doi:10.1590/s1678-9946201860052PubMedGoogle ScholarCrossref
2.
Valentim  FO , Lacerda  PN , Haddad  GR .  Tinea nigra: a series of three cases observed in Botucatu, São Paulo.   Rev Soc Bras Med Trop. 2021;54:e0563-e2020. doi:10.1590/0037-8682-0563-2020PubMedGoogle ScholarCrossref
3.
Piliouras  P , Allison  S , Rosendahl  C , Buettner  PG , Weedon  D .  Dermoscopy improves diagnosis of tinea nigra: a study of 50 cases.   Australas J Dermatol. 2011;52(3):191-194. doi:10.1111/j.1440-0960.2011.00790.xPubMedGoogle ScholarCrossref
4.
Bonifaz  A , Badali  H , de Hoog  GS ,  et al.  Tinea nigra by Hortaea werneckii, a report of 22 cases from Mexico.   Stud Mycol. 2008;61:77-82. doi:10.3114/sim.2008.61.07PubMedGoogle ScholarCrossref
AMA CME Accreditation Information

Credit Designation Statement: The American Medical Association designates this Journal-based CME activity activity for a maximum of 1.00  AMA PRA Category 1 Credit(s)™. Physicians should claim only the credit commensurate with the extent of their participation in the activity.

Successful completion of this CME activity, which includes participation in the evaluation component, enables the participant to earn up to:

  • 1.00 Medical Knowledge MOC points in the American Board of Internal Medicine's (ABIM) Maintenance of Certification (MOC) program;;
  • 1.00 Self-Assessment points in the American Board of Otolaryngology – Head and Neck Surgery’s (ABOHNS) Continuing Certification program;
  • 1.00 MOC points in the American Board of Pediatrics’ (ABP) Maintenance of Certification (MOC) program;
  • 1.00 Lifelong Learning points in the American Board of Pathology’s (ABPath) Continuing Certification program; and
  • 1.00 CME points in the American Board of Surgery’s (ABS) Continuing Certification program

It is the CME activity provider's responsibility to submit participant completion information to ACCME for the purpose of granting MOC credit.

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