Pityriasis rosea: Difference between revisions
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==Background== | ==Background== | ||
{{Skin anatomy background images}} | |||
*Mild inflammatory exanthem | *Mild inflammatory exanthem | ||
**May be caused by HHV 6 and 7 | **May be caused by HHV 6 and 7 | ||
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[[File:Pityriasisfront.jpg|thumb|Pityriasis rosea on front]] | [[File:Pityriasisfront.jpg|thumb|Pityriasis rosea on front]] | ||
[[File:Heraldpatch2.jpg|thumb|Herald patch]] | [[File:Heraldpatch2.jpg|thumb|Herald patch]] | ||
*Begins with single, "herald," patch (salmon-colored, fine scaling) | *Begins with single, "herald,"[[rash|patch]] (salmon-colored, fine scaling) | ||
**1-2 weeks prior to generalized eruption | **1-2 weeks prior to generalized eruption | ||
**Larger lesion (Herald Patch) that resembles the later smaller lesions | **Larger lesion (Herald Patch) that resembles the later smaller lesions | ||
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**Also has fine scaling but KOH is diagnostic | **Also has fine scaling but KOH is diagnostic | ||
{{ | {{Plaques DDX}} | ||
==Management== | ==Management== | ||
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==Disposition== | ==Disposition== | ||
*Discharge | *Discharge | ||
==See Also== | |||
==External Links== | |||
==References== | ==References== | ||
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[[Category:Pediatrics]] | [[Category:Pediatrics]] | ||
[[Category:Dermatology]] | [[Category:Dermatology]] | ||
[[Category:ID]] | |||
Latest revision as of 17:28, 11 December 2024
Background
- Mild inflammatory exanthem
- May be caused by HHV 6 and 7
- 70% preceded by URI [1]
- Most common 10-35yr old
- Not contagious
- Spontaneous resolution occurs within 4-12wk
Evaluation
- Begins with single, "herald,"patch (salmon-colored, fine scaling)
- 1-2 weeks prior to generalized eruption
- Larger lesion (Herald Patch) that resembles the later smaller lesions
- Typically on the abdomen
- Secondary maculopapular rash with plaques following Langer Lines ("Christmas tree" pattern)
- Typically follows rip distribution
- Pruritus can be moderate to severe
- Consider RPR or VDRL to rule out syphilis
Differential Diagnosis
- Psoriasis
- Tinea corporis
- Usually not as widespread
- Pityriasis versicolor
- Also has fine scaling but KOH is diagnostic
Plaques
- Psoriasis
- Bowen disease
- Discoid lupus erythematosus
- Drug eruption
- Erythema annulare centrifugum
- Lichen planus
- Lichen simplex chronicus
- Nummular dermatitis (nummular eczema)
- Parapsoriasis
- Pityriasis rosea
- Seborrheic dermatitis
Management
- Lasts 8 to 12 weeks[2]
- Reassurance about the self-limited nature
- Natural sunlight may speed up resolution
- Pruritus[3]
- Antihistamine, topical steroids
- Triamcinolone 0.1% - Adults
- Hydrocortisone 1% - Children
- Other
- Zinc oxide
- Calamine lotion
- Systemic steroids are generally not recommended.
- Antihistamine, topical steroids
- Rash or pruritus beyond 12 weeks: reconsider original diagnosis
- Consider biopsy to confirm the diagnosis
Disposition
- Discharge
See Also
External Links
References
- ↑ Sharma PK, Yadav TP, Gautam RK, Taneja N, Satyanarayana L (2000). "Erythromycin in pityriasis rosea: A double-blind, placebo-controlled clinical trial". Journal of the American Academy of Dermatology 42 (2 Patient 1): 241–4. PMID 1064267
- ↑ Richard P. Usatine and Jennifer Krejci-Manwaring: Rakel: Textbook of Family Medicine, 8th ed., Saunders 2011, (Ch) 33:p720
- ↑ Richard P. Usatine and Jennifer Krejci-Manwaring: Rakel: Textbook of Family Medicine, 8th ed., Saunders 2011, (Ch) 33:p720