[header] How to spot signs of illness in parrotlets [title] Check the quality of the feathers. [step] Ruffled, thin, patchy, or dull feathers can be a sign that there is something wrong. A disease or parasite may cause the feathers to fall out or the bird may be plucking them from stress. 
[substeps] If they live alone and pluck their feathers, they may be lonely, not sick! You should still take your parrotlet to the vet, but consider getting them a companion. [title] Examine their skin for swelling or lesions.