The differential diagnosis for<unk>  includes:
Chronic graft-versus-host disease
Psoriasis
Atopic dermatitis<unk>  simplex chronicus
Subacute cutaneous or discoid lupus erythematosus
Pityriasis rosea
Secondary syphilis
Prurigo nodularis
Paraneoplastic pemphigus/paraneoplastic autoimmune multiorgan syndrome (PAMS)
Oral leukoplakia
Oral candidiasis
Pemphigus vulgaris, benign mucous membrane pemphigoid<unk> oid drug eruption
Antimicrobials: aminosalicylate sodium, ethambutol, griseofulvin, ketoconazole, streptomycin, tetracycline, trovafloxacin, isoniazid
Antihistamines: ranitidine, roxatidine
Antihypertensives/antiarrhythmics: ACE-inhibitors, doxazosin, beta blockers, methyldopa, prazosin, nifedipine, quinidine
Antimalarial drugs: chloroquine, hydroxychloroquine, quinine
Antidepressants/anxiolytics/antipsychotics/AEDs: amitriptyline, carbamazepine, chlorpromazine, levomepromazine, methoprazine, imipramine, lorazepam, phenytoin
Diuretics: thiazide diuretics, furosemide, spironolactone
Antidiabetics: sulfonylureas
Metals: gold salts, arsenic, bismuth, mercury, palladium, lithium
NSAIDs
Proton pump inhibitors: omeprazole, lansoprazole, pantoprazole
Lipid lowering drugs: pravastatin, simvastatin, gemfibrozil
TNF-alpha antagonists: infliximab, adalimumab, etanercept, lenercept
Varia: allopurinol, bleomycin, cinnarizine, cyanamide, dapsone, hydroxyurea, hepatitis B-vaccine, imatinib, immunoglobulins, interferon alfa, l-thyroxin, levamisole, mesalamine, methycran, penicillamine, procainamide, pyrimethamine, pyrithioxine, quinacrine, sildenafil, sulfasalazine, terbinafine, trihexyphenidyl, ursodeoxycholic acid
Antimicrobials: aminosalicylate sodium, ethambutol, griseofulvin, ketoconazole, streptomycin, tetracycline, trovafloxacin, isoniazid
Antihistamines: ranitidine, roxatidine
Antihypertensives/antiarrhythmics: ACE-inhibitors, doxazosin, beta blockers, methyldopa, prazosin, nifedipine, quinidine
Antimalarial drugs: chloroquine, hydroxychloroquine, quinine
Antidepressants/anxiolytics/antipsychotics/AEDs: amitriptyline, carbamazepine, chlorpromazine, levomepromazine, methoprazine, imipramine, lorazepam, phenytoin
Diuretics: thiazide diuretics, furosemide, spironolactone
Antidiabetics: sulfonylureas
Metals: gold salts, arsenic, bismuth, mercury, palladium, lithium
NSAIDs
Proton pump inhibitors: omeprazole, lansoprazole, pantoprazole
Lipid lowering drugs: pravastatin, simvastatin, gemfibrozil
TNF-alpha antagonists: infliximab, adalimumab, etanercept, lenercept
Varia: allopurinol, bleomycin, cinnarizine, cyanamide, dapsone, hydroxyurea, hepatitis B-vaccine, imatinib, immunoglobulins, interferon alfa, l-thyroxin, levamisole, mesalamine, methycran, penicillamine, procainamide, pyrimethamine, pyrithioxine, quinacrine, sildenafil, sulfasalazine, terbinafine, trihexyphenidyl, ursodeoxycholic acid
Lichen planus
The differential diagnosis for lichen planus includes:
Lichen sclerosus
Chronic graft-versus-host disease
Tinea corporis
Psoriasis
Vitiligo
Atopic dermatitis