Guttate psoriasis is a distinctive acute skin eruption characterised by small drop-like, salmon-pink papules which usually have a fine scale. This variant primarily occurs on the trunk and the proximal extremities but it may have a more generalised distribution. A history of an upper respiratory infection secondary to group A beta haemolytic streptococci often precedes the eruption by 2-3 weeks. Guttate psoriasis may be chronic and unrelated to streptococcal infection.
- It is more common in individuals younger than 30 years.
- Genetic predisposition: guttate psoriasis has been linked with HLA-BW17, HLA-B13, HLA-CW6.[2, 3]
- It is most often associated with streptococcal infection - two thirds have evidence of a recent streptococcal throat infection - but may also be associated with stress, trauma (Köbner's phenomenon) or drugs - eg, antimalarials, lithium, non-steroidal anti-inflammatory drugs, beta-blockers.
- In most cases there is a history of an antecedent streptococcal infection, usually of the upper respiratory tract, such as pharyngitis or tonsillitis, 2-3 weeks prior to the eruption.
- There may be a positive family history of psoriasis.
- The onset of the skin lesions is often acute, with multiple papules erupting on the trunk and the proximal extremities.
- Lesions may sometimes spread to involve the face, the ears and the scalp.
- The palms and the soles are rarely affected.
- The rash is often associated with mild itching.
- Like other forms of psoriasis, guttate psoriasis tends to improve during the summer and worsen during the winter.
- Examination of the skin reveals characteristic lesions consisting of multiple, discrete drop-like salmon-pink papules. A fine scale may be seen on established lesions.
- Nail changes characteristic of chronic psoriasis (eg, pits, ridges and the oil-drop sign) are usually absent.
- Nummular dermatitis.
- Pityriasis rosea.
- Lichen planus.
- Drug eruption.
- Viral exanthem.
- Cutaneous T-cell lymphoma.
- Pityriasis lichenoides.
- Diagnosis is clinical and biopsy is usually not required.
- Dermoscopy may be useful in differentiating guttate psoriasis from chronic pityriasis lichenoides.
- Serology: levels of antibodies to streptolysin O (ASO) may be elevated.
- Cultures: bacterial culture of the throat or perianal area.
Treatment of acute guttate psoriasis is not based on trial evidence; rather, it is guided by expert opinion.
- Usually, the rash resolves within a few weeks to months without treatment, so simple reassurance and emollients may therefore be sufficient.
- Clearance of guttate lesions can be accelerated by judicious exposure to sunlight or by a short course of narrow-band ultraviolet B (UVB) phototherapy, so consider early referral in those who do not respond to topical treatment.
- Topical treatment with a vitamin D preparation, topical corticosteroid, or coal tar preparation can be considered but may be difficult due to the extent, size and wide distribution of lesions.
- Antibiotic treatment has often been given because of the association between guttate psoriasis and streptococcal infection but there is no evidence of any definite benefit.Some advocate that potential streptococcal infection in guttate psoriasis should not routinely be investigated or treated, as treatment has not been shown to alter the course of the cutaneous disease nor are there documented risks of post-streptococcal sequelae associated with this condition.
- A prospective study reported that the use of tonsillectomy for patients with chronic guttate psoriasis may be beneficial.
- Targeted therapy may result from research exploiting the role of the cytokine interleukin (IL)-17 in the pathogenesis of guttate and several other forms of psoriasis.
Complications are largely iatrogenic:
- Steroid-induced cutaneous atrophy, telangiectasia, hypopigmentation.
- PUVA side-effects - eg, nausea and vomiting, photosensitivity.
- Guttate psoriasis often runs a self-limited course over several weeks to a few months with complete remission in about 60%. Other patients go on to develop chronic plaque-type psoriasis. Good prognosis is associated with younger age and high ASO titres, whilst poorer prognosis is associated with a family history of psoriasis.
- Scarring is not a problem.
- Previously affected areas may show post-inflammatory hypopigmentation or hyperpigmentation.
- Recurrent episodes may occur, especially with pharyngeal carriage of streptococci.
Further reading and references
; Serum levels of LL-37 and inflammatory cytokines in plaque and guttate psoriasis. Mediators Inflamm. 20142014:268257. doi: 10.1155/2014/268257. Epub 2014 Aug 14.
; DermIS (Dermatology Information System)
; Psoriasis. Am Fam Physician. 2013 May 187(9):626-33.
; Hla-a and hla-B alleles associated in psoriasis patients from mumbai, Western India. Indian J Dermatol. 2011 Sep-Oct56(5):497-500. doi: 10.4103/0019-5154.87128.
; Guttate HLA-B13, The Manual of Dermatology, 2012.
; An investigation of antistreptococcal antibody responses in guttate psoriasis. Arch Dermatol Res. 2008 Sep300(8):441-9. Epub 2008 Jul 22.
; Differentiation of pityriasis lichenoides chronica from guttate psoriasis by dermoscopy. Clin Exp Dermatol. 2015 Oct40(7):804-6. doi: 10.1111/ced.12580. Epub 2015 Feb 16.
; Guttate Psoriasis, Primary Care Dermatology Society
; Scottish Intercollegiate Guidelines Network - SIGN (October 2010)
; Antistreptococcal treatment of guttate psoriasis: a controlled study. Int J Dermatol. 2008 Sep47(9):950-2. doi: 10.1111/j.1365-4632.2008.03663.x.
; To treat or not to treat? Management of guttate psoriasis and pityriasis rosea in patients with evidence of group A Streptococcal infection. J Drugs Dermatol. 2010 Mar9(3):241-50.
; Improvement of psoriasis after tonsillectomy is associated with a decrease in the frequency of circulating T cells that recognize streptococcal determinants and homologous skin determinants. J Immunol. 2012 May 15188(10):5160-5. doi: 10.4049/jimmunol.1102834. Epub 2012 Apr 9.
; Psoriasis Targeted Therapy: Characterization of Interleukin 17A Expression in Subtypes of Psoriasis. J Drugs Dermatol. 2015 Oct 114(10):1133-6.
; Clinical course of guttate psoriasis: long-term follow-up study. J Dermatol. 2010 Oct37(10):894-9. doi: 10.1111/j.1346-8138.2010.00871.x.
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