Apply binarization and skeletonize to a python fingerprint

Question

I’m trying to make a digital recognition program in python, in the skeletonization part, the image gets lines, as below:

The original image is this:

My code:

    import cv2 as cv
    import numpy as np
    from matplotlib import pyplot as plt
    from skimage.morphology import skeletonize as skelt
    from skimage.morphology import thin
    from skimage import morphology, filters
    
    #pega a imagem
    img = cv.imread('impressoes/01.jpg', 16)
    
    
    #binariza a imagem
    binary = img > filters.threshold_otsu(img)
    
    thin = thin(binary)
    
    #faz a skeletonization
    skeleton = skelt(binary)
    
    
    plt.imshow(skeleton, 'gray')
    plt.show()

How I remove those lines that were created?