Pulex Irritans.

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Henry Weightman Stelwagon

(Synonym: Common Flea.)

Describe the cutaneous disturbance produced by the pulex irritans.

It consists of an erythematous spot with a minute central hemorrhagic point. In irritable skin, a wheal-like lesion may result.

Treatment consists of applications of camphor or ammonia-water; carbolic acid and thymol lotions are also useful.

RELATIVE FREQUENCY OF THE VARIOUS DISEASES OF SKIN AS SHOWN BY THE STATISTICS (123,746 CASES) OF THE AMERICAN DERMATOLOGICAL ASSOCIATION FOR TEN YEARS, 1878-87.

CLASSIFICATION OF
DISEASES.		 No.
Cases.		 %
Cases.		 CLASSIFICATION OF
DISEASES.		 No.
Cases.		 %
Cases.
Class I. Disorders of the
Glands.		 Verruca necrogenica 2 .001
1. OF THE SWEAT GLANDS. NÆvus pigmentosus 88 .064
Hyperidrosis 328 .265 Xerosis 100 .080
Sudamen 268 .216 Ichthyosis 309 .249
Anidrosis 11 .009 Onychauxis 70 .056
Bromidrosis 112 .090 Hypertdichosis 515 .416
Chromidrosis 7 .005 3. OF CONNECTIVE TISSUE.
Uridrosis .... .... Sclerema neonatorum .... ....
2. OF THE SEBACEOUS
GLANDS		 238 .193 Scleroderma 38 0.030
Seborrhoea: 1812 1.47 Morphoea 39 0.031
a. oleosa 367 .296 Elephantiasis 57 0.046
b. sicca 395 .319 Rosacea: 785 0.634
Comedo 1225 .989 a. erythematosa 381 0.308
Cyst 6 .004 b. hypertrophica 58 0.047
a. Milium 225 .183 Framboesia 22 0.018
b. Steatoma 151 .122 Class V. Atrophies.
Asteatosis 8 .006 1. OF PIGMENT.
Class II. Inflammations. Leucoderma 77 0.062
Exanthemata 1770 1.43 Albinismus 9 0.008
Erythema simplex 1064 .859 Vitiligo 191 0.155
Erythema multiforme: 915 .730 Canities 43 0.035
a. papulosum 325 .262 2. OF HAIR.
b. bullosum 37 .029 Alopecia 926 0.749
c. nodosum 82 .066 Alopecia furfuracea 830 0.67
Urticaria 2994 2.47 Alopecia areata 794 0.641
pigmentosa 1 .0008 Atrophia pilorum propria 23 0.019
[E]Dermatitis: 1720 1.39 Trichorexis nodosa 3 0.002
a. traumatica 468 .378 3. OF NAIL 26 0.021
b. venenata 616 .498 Atrophia unguis 19 0.015
c. calorica 224 .187 4. OF CUTIS 6 0.005
d. medicamentosa 108 .087 Atrophia senilis 15 0.013
e. gangrÆnosa 8 .006 Atrophia maculosa et
striata		 23 0.019
Erysipelas 1026 .829 Class VI. New Growths.
Furunculus 2129 1.72 1. OF CONNECTIVE TISSUE. 1 0.0008
Anthrax 252 .203 Keloid 152 0.124
Phlegmona diffusa 265 .215 Cicatrix 89 0.065
Pustula maligna 197 .159 Fibroma 93 0.075
Herpes simplex 2057 1.66 Neuroma 11 0.009
Herpes zoster 1428 1.15 Xanthoma 69 0.056
Dermatitis herpetiformis 41 .033 2. OF MUSCULAR TISSUE.
Psoriasis 4131 3.34 Myoma 1 0.0008
Pityriasis maculuta et
circinata		 71 .057 3. OF VESSELS.
Dermatitis exfoliativa 16 .012 Angioma 462 0.373
Pityriasis rubra 44 .032 Angioma pigmentosum
et atrophicum		 13 0.010
Lichen: 144 .116 Angioma cavernosum 22 0.018
a. planus 154 .124 Lymphangioma 16 .012
b. ruber 27 .021 4. Mycosis fongoide 1 .0008
Eczema: 37661 30.43 Rhinoscleroma 3 .002
a. erythematosum .... .... Lupus erythematosus 477 .385
b. papulosum .... .... Lupus vulgaris 536 .433
c. vesiculosum .... .... Scrofuloderma 663 .536
d. madidans .... .... Syphiloderma: 13888 11.22
e. pustulosum .... .... a. erythematosum .... ....
f. rubrum .... .... b. papulosum .... ....
g. squamosum .... .... c. pustulosum .... ....
Prurigo 34 .027 d. tuberculosum .... ....
Acne 9077 7.34 e. gummatosum .... ....
Acne rosacea 398 .321 Lepra: 24 .020
Sycosis 227 .185 a. tuberosa 7 .005
Impetigo 1769 1.43 b. maculosa 4 .003
Impetigo contagiosa 600 .485 c. anÆsthetica 6 .004
Impetigo herpetiformis 10 .009 Carcinoma 1068 .863
Ecthyma 726 .587 Sarcoma 55 .044
Pemphigus 183 .148 Class VII. Neuroses.
Ulcers 3021 2.44 HyperÆsthesia: 4 .003
Class III. Hemorrhages. a. Pruritus 2716 2.12
Purpura: 341 .275 b. Dermatalgia 11 .009
a. simplex 181 .145 AnÆsthesia 22 .018
b. hÆmorrhagica 49 .039 Class VIII. Parasitic
Affections.
Class IV. Hypertrophies. 1. VEGETABLE.
1. OF PIGMENT. Tinea favosa 354 .286
Lentigo 127 .103 Tinea trichophytina: 2289 1.85
Chloasma 560 .452 a. circinata 705 .569
2. OF EPIDERMAL AND
PAPILLARY LAYERS.		 b. tonsurans 675 .545
Keratosis: 94 .076 c. sycosis 365 .295
a. pilaris 103 .083 Tinea versicolor 1263 1.02
b. senilis 68 .055 2. ANIMAL.
Molluscum epitheliale 172 .139 Scabies 3192 2.58
Callositas 110 .090 Pediculosis capillitii 2579 2.09
Clavus 84 .068 Pediculosis corporis 1704 1.38
Cornu cutaneum 42 .034 Pediculosis pubis 436 .352
Verruca 1252 1.09 Total 123746

[E] Indicating affections of this class not properly included under other titles.

                                                                                                                                                                                                                                                                                                           

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