secondary pyoderma

sec·on·dar·y py·o·der·ma

a pyoderma in which an existing skin lesion (for example, eczema, herpes, seborrheic dermatitis) becomes secondarily infected.
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The condition was tentatively diagnosed as a cutaneous tumor with secondary pyoderma. In order to arrive at a definitive diagnosis, a cutaneous punch biopsy was performed after selecting two lesions, one ulcerated and one non-ulcerated.
Secondary pyoderma was present in 26/40 of cases (65%) to eczema (10/40, 25%), pruritis (8/40, 20%) and scabies (8/40, 20%) (Table-1).
Secondary pyoderma is primarily caused by conditions that involve bacterial infections below the epidermal layer of skin.
Primary bacterial skin infections (primary pyoderma) accounted for 12 (24%) cases while 38 (76%) cases were of secondary pyoderma. Among the primary pyodermas, impetigo was the commonest entity seen (nine cases-18%); among the secondary pyodermas, secondarily infected pemphigus vulgaris was the commonest, being seen in 22 cases (44%) [Table 2].
Distribution of Cases of Primary and Secondary Pyoderma Primary Pyodermas n Secondary Pyodermas n Impetigo 9 (18%) Infective Pemphigus 22(44%) Folliculitis 2 (4%) Infective SJS 8 (16%) Carbuncle 1 (2%) Infective Exfoliative 4 (8%) dermatitis Infective Scabies 3 (6%) Infective Atopic 1 (2%) dermatitis Total 12 (24%) 38 (76%) Table 3.
Some conditions that contribute to the secondary pyodermas are ectoparasite infestations, fungal infections, atopic or contact type allergic responses, a weakened immune system as a result of poor nutrition or prolonged steroid use, cancer, or endocrine diseases like diabetes, hypothyroidism.
An experimental deficiency in dogs provokes the appearance of dry seborrhea, diffuse alopecia, erythroderma, secondary pyoderma and anomalies of immune system.
Atopic dogs with secondary pyoderma respond to antibiotic and immunotherapy.
Secondary pyoderma is a concurrent problem in chronic cases of sarcoptic mange but was seen only in four dogs.
(1990)-38 (30%) had primary pyodermas and 89 (70%) had secondary pyodermas of the primary pyodermas (71%) were due Staphylococcus aureus and 5% were due to multiple organism.
In the clinico-bacteriological study of pyodermas in children by Kaker N, Kumar V, et al (1999) primary pyodermas were observed in 72% of the children and secondary pyodermas in (28%).