There are many interesting webpages on the history of leprosy, including the Global Project on the History of Leprosy.

In addition to crutches and other sorts of mobility aids, other items somewhat particular to lepers to note include rattles or clappers and begging bowls.

[Leprosy] hath much tokens and signs. In them the flesh is notably corrupt, the shape is changed, the eyen become round, the eyelids are revelled, the sight sparkleth, the nostrils are straited and revelled and shrunk. The voice is hoarse, swelling groweth in the body, and many small botches and whelks hard and round, in the legs and in the utter parts; feeling is somedeal taken away. The nails are boystous and bunchy, the fingers shrink and crook, the breath is corrupt, and oft whole men are infected with the stench thereof. The flesh and skin is fatty, insomuch that they may throw water thereon, and it is not the more wet, but the water slides off, as it were off a wet hide. Also in the body be diverse specks, now red, now black, now wan, now pale. The tokens of leprosy be most seen in the utter parts, as in the feet, legs, and face; and namely in wasting and minishing of the brawns of the body.

To heal or to hide leprosy, best is a red adder with a white womb, if the venom be away, and the tail and the head smitten off, and the body sod with leeks, if it be oft taken and eaten.

De proprietatibus rerum

• The Feast of Dives, a sacramentary (Bibl. Sainte-Geneviève MS 102, fol. 271v), c. 1270
• St. Elizabeth of Thuringia and the patients, The Picture-Book of Madame Marie (BNF NAL 16251, fol. 103v), c. 1285-1290
• The Feast of Dives, La Somme le Roi (Bibl. Mazarine MS 870, fol. 179), 1295
• Scenes from the life of St. Elizabeth, wall-paintings from St. Hubertus' Church in Mardorf, c. 1300
• Healing a leper (fol. 6v) and healing a leper (fol. 24), Sermons of Maurice de Sully (BNF Fr. 187, fol. 6v), c. 1320-1330
• Elisha and Naaman (fol. 153v), Joram and the lepers (fol. 154v), Job has leprosy (fol. 234), The Feast of Dives (fol. 413v), Bible historiale (BNF Fr. 152), 14th century
• A leper, Pilgrimage of the Heart (Bibl. Sainte-Geneviève MS 1130, fol. 113v), c. 1367-1399
• Christ healing a leper who holds a rattle (fol. 470v) and Christ and the ten lepers (fol. 505v), Bible historiale (MMW 10 B 23), 1372
• Job has leprosy, Bible historiale (BNF Fr. 164, fol. 150), fourth quarter of the 14th century
• Two scenes from the life of St. Elizabeth, c. 1386-1400
He knew the tavernes wel in every toun
And everich hostiler and tappestere
Bet than a lazar or a beggestere;
For unto swich a worthy man as he
Acorded nat, as by his facultee,
To have with sike lazars aqueyntaunce.

The General Prologue (description of the Friar)
from The Canterbury Tales, ll. 240-245

• Leper, Pontifical; Tabula (Brit. Lib. Lansdowne 451, fol. 127), first quarter of the 15th century
• Christ heals a leper (fol. 57v), a leper (fol. 58r), the healed leper and an offering (fol. 58v), Christ heals another leper (fol. 72v), a book of hours (PML M.359), c. 1430-1435
• Healing a leper, Speculum historiale (BNF Fr. 50, fol. 220v), 1463
• St. Josaphat, the leper, and the blind man, Speculum historiale (BNF Fr. 51, fol. 171), 1463
• A leper sits in the street, holding a clapper, Vita Christi (BNF Fr. 178, fol. 67), fourth quarter of the 15th century
• Christ heals lepers, Vita Christi (PML M.894, fol. 112v), c. 1485
• The apostles preach, The Golden Legend (BNF Fr. 244, fol. 158), c. 1480-1490
• St. Elizabeth of Thuringia bathes the lepers in the Elizabeth Altarpiece from the Church of St. Agidius at Bardejov, c. 1480-1500
• Sermon on the Mount by Cosimo Rosselli, 1481-1482
• A leper, Kuttenberger Kantionale (ÖNB Mus. Hs. 15501, fol. 97v), 1490
• St. Louis of Toulouse cares for the sick in an altarpiece from Rothenburg, c. 1490-1500
• St. Elizabeth of Thuringia bathes the lepers in an altarpiece from Laufen, c. 1495-1505; note that their clothing seems to be similar to that of a pilgrim
• Dives and Lazarus, The Tilliot Hours (British Library Yates Thompson 5, fol. 70v), c. 1500
• Procession banner: The Virgin and Child with St. Lazarus, c. 1502
• An altarpiece with St. Martin, St. Elizabeth of Thuringia, and St. Katherine from St. Florian, c. 1510-1520
• A leper holding a clapper from an altarpiece in Kärnten, c. 1510-1520; also this detail (though I am unsure whether he is a leper too, or just a pilgrim)
St Peter and St John Healing the Cripple by Albrecht Dürer, 1513
• The miracle of St. Denis, Chroniques Françaises (BNF Fr. 2819), c. 1516-1525
• Wooden leper clapper, 17th century (also here)