Severely Pruritic, Whip-like Dermatitis
Am Fam Physician. 2021 Feb 15;103(4):243-244.
A 36-year-old patient presented with fever, headache, cough, sore throat, and a new widespread pruritic rash that began 48 hours earlier. The patient had no significant medical or surgical history and was not taking any new medications. The patient had no change in diet, no exposures to chemicals, and no symptomatic contacts.
Examination revealed a maculopapular, erythematous rash with whip-like extensions (Figure 1). The rash was most prominent on the lower abdomen, buttocks, and thighs but extended to the extremities and face, including the vermilion border and eyelids. The rash spared the mucosal surfaces, palms, and soles.
Based on the patient's history and physical examination findings, which one of the following is the most likely diagnosis?
A. Bleomycin-induced flagellate dermatitis.
B. Contact dermatitis.
D. Herpes zoster (shingles).
E. Shiitake flagellate dermatitis.
The answer is E: shiitake flagellate dermatitis. The patient revealed that they had consumed raw shiitake mushrooms two days before symptom onset.
Shiitake flagellate dermatitis was first described in susceptible individuals after ingesting raw or undercooked shiitake mushrooms but has more recently been reported with fully cooked mushrooms and with extract.1,2 The exanthem is thought to be secondary to lentinan, a heat-labile protein present in undercooked mushrooms. The exact etiology is unclear, but lentinan is thought to increase secretion of inflammatory cytokine interleukin-1, resulting in vasodilation and hemorrhage.3
The condition develops 24 to 48 hours after
Referencesshow all references
1. Chu EY, Anand D, et al. Shiitake dermatitis. Cutis. 2013;91(6):287–290....
2. Kopp T, Mastan P, Mothes N, et al. Systemic allergic contact dermatitis due to consumption of raw shiitake mushroom. Clin Exp Dermatol. 2009;34(8):e910–e913.
3. Fang S, Bajoghli A, Bajoghli M. Shiitake mushroom-induced flagellate dermatitis. Ann Allergy Asthma Immunol. 2017;119(5):462–463.
4. Stephany MP, Chung S, Handler MZ, et al. Shiitake mushroom dermatitis: a review [published correction appears in Am J Clin Dermatol. 2016; 17(6):709]. Am J Clin Dermatol. 2016;17(5):485–489.
5. Ribeiro CS, Sodré CT, Ramos-E-Silva M. Flagellate dermatitis by shiitake mushroom. Case Rep Dermatol. 2019;11(2):220–225.
6. Ko SY. Flagellate dermatitis. Clin Pract Cases Emerg Med. 2017;1(1):63–64.
7. Mowad CM, Nguyen TV, Elenitsas R, et al. Bleomycin-induced flagellate dermatitis. Br J Dermatol. 1994;131(5):700–702.
8. Arseculeratne G, Berroeta L, Meiklejohn D, et al. Bleomycin-induced “flagellate dermatitis.” Arch Dermatol. 2007;143(11):1461–1462.
9. Mendonça FM, Márquez-García A, Méndez-Abad C, et al. Flagellate dermatitis and flagellate erythema. Int J Dermatol. 2017;56(4):461–463.
10. Lachapelle JM. Allergic contact dermatitis: clinical aspects. Rev Environ Health. 2014;29(3):185–194.
11. Nousari HC, Ha VT, Laman SD, et al. “Centripetal flagellate erythema.” J Rheumatol. 1999;26(3):692–695.
12. Sena P, Gianatti A, Gambini D. Dermatomyositis: clinicopathological correlations. G Ital Dermatol Venereol. 2018;153(2):256–264.
13. Bolton L. Herpes zoster (shingles). Wounds. 2018;30(5):144–146.
This series is coordinated by John E. Delzell Jr., MD, MSPH, associate medical editor.
A collection of Photo Quiz published in AFP is available at https://www.aafp.org/afp/photoquiz.
The editors of AFP welcome submissions for Photo Quiz. Guidelines for preparing and submitting a Photo Quiz manuscript can be found in the Authors' Guide at https://www.aafp.org/afp/photoquizinfo. To be considered for publication, submissions must meet these guidelines. E-mail submissions to email@example.com.
Copyright © 2021 by the American Academy of Family Physicians.
This content is owned by the AAFP. A person viewing it online may make one printout of the material and may use that printout only for his or her personal, non-commercial reference. This material may not otherwise be downloaded, copied, printed, stored, transmitted or reproduced in any medium, whether now known or later invented, except as authorized in writing by the AAFP. Contact firstname.lastname@example.org for copyright questions and/or permission requests.
Want to use this article elsewhere? Get Permissions